#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""验证字体子集与原始字体的字形一致性"""

from fontTools.ttLib import TTFont
from fontTools.ttLib.tables import _h_m_t_x, _g_a_s_p
import os

# 修补表解析
original_hmtx = _h_m_t_x.table__h_m_t_x.decompile
def patched_hmtx(self, data, ttFont):
    try: return original_hmtx(self, data, ttFont)
    except: self.metrics = {}
_h_m_t_x.table__h_m_t_x.decompile = patched_hmtx

original_gasp = _g_a_s_p.table__g_a_s_p.decompile
def patched_gasp(self, data, ttFont):
    try: return original_gasp(self, data, ttFont)
    except: self.gaspRanges = {}
_g_a_s_p.table__g_a_s_p.decompile = patched_gasp

base = 'src/app/fonts'

# 加载字体
original = TTFont(f'{base}/AoyagiReisho.ttf')
subset = TTFont(f'{base}/AoyagiReisho-subset.ttf')

print("=" * 50)
print("字体对比验证")
print("=" * 50)

# 文件大小
orig_size = os.path.getsize(f'{base}/AoyagiReisho.ttf')
sub_size = os.path.getsize(f'{base}/AoyagiReisho-subset.ttf')
print(f"\n原始字体大小: {orig_size / 1024:.1f} KB ({orig_size} bytes)")
print(f"子集字体大小: {sub_size / 1024:.1f} KB ({sub_size} bytes)")

# CMAP 对比
orig_cmap = original.getBestCmap()
sub_cmap = subset.getBestCmap()

target_chars = [0x20, 0x777f, 0x65b0, 0x81f4, 0x9060]
char_names = {0x20: '空格', 0x777f: '睿', 0x65b0: '新', 0x81f4: '致', 0x9060: '遠'}

print("\n字符映射对比:")
for code in target_chars:
    name = char_names[code]
    orig_glyph = orig_cmap.get(code, 'MISSING')
    sub_glyph = sub_cmap.get(code, 'MISSING')
    match = "✓" if orig_glyph == sub_glyph else "✗"
    print(f"  U+{code:04X} ({name}): 原始={orig_glyph}, 子集={sub_glyph} {match}")

# 字形数量
print(f"\n字形数量:")
print(f"  原始: {len(original.getGlyphOrder())}")
print(f"  子集: {len(subset.getGlyphOrder())}")

# 表对比
print("\n字体表:")
orig_tables = set(original.keys())
sub_tables = set(subset.keys())
print(f"  原始表: {sorted(orig_tables)}")
print(f"  子集表: {sorted(sub_tables)}")

original.close()
subset.close()

print("\n" + "=" * 50)